go.opentelemetry.io/otel/trace v1.44.0: TracerOption

Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: verify go.opentelemetry.io/otel/trace.TracerOption in pkg:golang/go.opentelemetry.io/otel/trace@v1.44.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/go.opentelemetry.io/otel/trace@v1.44.0
Demonstrate these symbols/APIs:
  - go.opentelemetry.io/otel/trace.TracerOption
Required runtime conditions:
  - ecosystem: golang
  - language: go
  - packageManager: go@1.26.6
  - runtime: go@1.26.6

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.

{"case":{"caseId":"case:sha256:92d40f5d1e20536ac79cc29a3dbc61d26ce6b4f4a3dc312e3a2cba573eec6a87","contract":["NewTracerConfig returns default TracerConfig with empty version schema URL and attributes when called with no TracerOption","NewTracerConfig applies WithInstrumentationVersion TracerOption to configure instrumentation version","NewTracerConfig applies WithSchemaURL TracerOption to configure schema URL","NewTracerConfig applies WithInstrumentationAttributes and WithInstrumentationAttributeSet TracerOptions to configure scope attributes","NewTracerConfig applies multiple TracerOption configurations and resolves duplicate scalar options via last-value-wins"],"goal":"verify go.opentelemetry.io/otel/trace.TracerOption in pkg:golang/go.opentelemetry.io/otel/trace@v1.44.0","kind":"HOW","packages":["pkg:golang/go.opentelemetry.io/otel/trace@v1.44.0"],"schemaVersion":1,"symbols":["go.opentelemetry.io/otel/trace.TracerOption"]},"contractCommand":["go","run","./test"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"golang","language":"go","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"go","packageManagerVersion":"1.26.6","runtime":"go","runtimeVersion":"1.26.6","schemaVersion":1},"license":"MIT-0","packages":["pkg:golang/go.opentelemetry.io/otel/trace@v1.44.0"],"schemaVersion":1,"subject":"pkg:golang/go.opentelemetry.io/otel/trace@v1.44.0","symbols":["go.opentelemetry.io/otel/trace.TracerOption"],"verifierAdapter":"golang@1"}

module sample

go 1.26.6

require (
	go.opentelemetry.io/otel v1.44.0
	go.opentelemetry.io/otel/trace v1.44.0
)

require github.com/cespare/xxhash/v2 v2.3.0 // indirect

github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UFvs=
github.com/cespare/xxhash/v2 v2.3.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/google/go-cmp v0.7.0 h1:wk8382ETsv4JYUZwIsn6YpYiWiBsYLSJiTsyBybVuN8=
github.com/google/go-cmp v0.7.0/go.mod h1:pXiqmnSA92OHEEa9HXL2W4E7lf9JzCmGVUdgjX3N/iU=
github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
github.com/stretchr/testify v1.11.1 h1:7s2iGBzp5EwR7/aIZr8ao5+dra3wiQyKjjFuvgVKu7U=
github.com/stretchr/testify v1.11.1/go.mod h1:wZwfW3scLgRK+23gO65QZefKpKQRnfz6sD981Nm4B6U=
go.opentelemetry.io/otel v1.44.0 h1:JjwHmHpA4iZ3wBxluu2fbbE7j4kqlE8jXyAyPXH7HqU=
go.opentelemetry.io/otel v1.44.0/go.mod h1:BMgjTHL9WPRlRjL2oZCBTL4whCGtXch2H4BhOPIAyYc=
go.opentelemetry.io/otel/trace v1.44.0 h1:jxF5CsGYCe74MCRx2X4g7WsY/VBKRqqpNvXlX/6gtIk=
go.opentelemetry.io/otel/trace v1.44.0/go.mod h1:oLl1jrMQAVo6v3GAggN+1VH9VIz9iUSvW53sW1Q8PIE=
gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

package main

import (
	"fmt"

	"go.opentelemetry.io/otel/attribute"
	"go.opentelemetry.io/otel/trace"
)

func main() {
	options := []trace.TracerOption{
		trace.WithInstrumentationVersion("v1.44.0"),
		trace.WithSchemaURL("https://opentelemetry.io/schemas/1.24.0"),
		trace.WithInstrumentationAttributes(
			attribute.String("service.name", "demo-service"),
			attribute.String("environment", "production"),
		),
	}

	cfg := trace.NewTracerConfig(options...)
	attrs := cfg.InstrumentationAttributes()
	fmt.Printf("Tracer configured: version=%s, schemaURL=%s, attributes=%d\n",
		cfg.InstrumentationVersion(),
		cfg.SchemaURL(),
		attrs.Len(),
	)
}

{
  "schemaVersion": 1,
  "goal": "verify go.opentelemetry.io/otel/trace.TracerOption in pkg:golang/go.opentelemetry.io/otel/trace@v1.44.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/go.opentelemetry.io/otel/trace@v1.44.0"
  ],
  "symbols": [
    "go.opentelemetry.io/otel/trace.TracerOption"
  ],
  "runtimeConditions": {
    "ecosystem": "golang",
    "language": "go",
    "packageManager": "go@1.26.6",
    "runtime": "go@1.26.6"
  }
}

package main

import (
	"fmt"
	"os"

	"go.opentelemetry.io/otel/attribute"
	"go.opentelemetry.io/otel/trace"
)

func main() {
	// 1. NewTracerConfig returns default TracerConfig with empty version schema URL and attributes when called with no TracerOption
	defaultCfg := trace.NewTracerConfig()
	if defaultCfg.InstrumentationVersion() != "" {
		fmt.Fprintf(os.Stderr, "expected empty version, got %q\n", defaultCfg.InstrumentationVersion())
		os.Exit(1)
	}
	if defaultCfg.SchemaURL() != "" {
		fmt.Fprintf(os.Stderr, "expected empty schema URL, got %q\n", defaultCfg.SchemaURL())
		os.Exit(1)
	}
	defaultAttrs := defaultCfg.InstrumentationAttributes()
	if defaultAttrs.Len() != 0 {
		fmt.Fprintf(os.Stderr, "expected 0 attributes, got %d\n", defaultAttrs.Len())
		os.Exit(1)
	}

	// 2. NewTracerConfig applies WithInstrumentationVersion TracerOption to configure instrumentation version
	versionOpt := trace.WithInstrumentationVersion("v1.44.0")
	versionCfg := trace.NewTracerConfig(versionOpt)
	if versionCfg.InstrumentationVersion() != "v1.44.0" {
		fmt.Fprintf(os.Stderr, "expected version v1.44.0, got %q\n", versionCfg.InstrumentationVersion())
		os.Exit(1)
	}

	// 3. NewTracerConfig applies WithSchemaURL TracerOption to configure schema URL
	schemaOpt := trace.WithSchemaURL("https://opentelemetry.io/schemas/1.24.0")
	schemaCfg := trace.NewTracerConfig(schemaOpt)
	if schemaCfg.SchemaURL() != "https://opentelemetry.io/schemas/1.24.0" {
		fmt.Fprintf(os.Stderr, "expected schema URL https://opentelemetry.io/schemas/1.24.0, got %q\n", schemaCfg.SchemaURL())
		os.Exit(1)
	}

	// 4. NewTracerConfig applies WithInstrumentationAttributes and WithInstrumentationAttributeSet TracerOptions to configure scope attributes
	attrOpt := trace.WithInstrumentationAttributes(
		attribute.String("env", "prod"),
		attribute.String("region", "us-east-1"),
	)
	setOpt := trace.WithInstrumentationAttributeSet(
		attribute.NewSet(attribute.String("app", "gateway")),
	)
	attrCfg := trace.NewTracerConfig(attrOpt, setOpt)
	attrs := attrCfg.InstrumentationAttributes()
	if attrs.Len() != 3 {
		fmt.Fprintf(os.Stderr, "expected 3 attributes, got %d\n", attrs.Len())
		os.Exit(1)
	}
	if val, ok := attrs.Value(attribute.Key("env")); !ok || val.AsString() != "prod" {
		fmt.Fprintf(os.Stderr, "expected env=prod, got %v (ok: %v)\n", val, ok)
		os.Exit(1)
	}
	if val, ok := attrs.Value(attribute.Key("region")); !ok || val.AsString() != "us-east-1" {
		fmt.Fprintf(os.Stderr, "expected region=us-east-1, got %v (ok: %v)\n", val, ok)
		os.Exit(1)
	}
	if val, ok := attrs.Value(attribute.Key("app")); !ok || val.AsString() != "gateway" {
		fmt.Fprintf(os.Stderr, "expected app=gateway, got %v (ok: %v)\n", val, ok)
		os.Exit(1)
	}

	// 5. NewTracerConfig applies multiple TracerOption configurations and resolves duplicate scalar options via last-value-wins
	multiOpts := []trace.TracerOption{
		trace.WithInstrumentationVersion("v1.0.0"),
		trace.WithSchemaURL("https://opentelemetry.io/schemas/1.20.0"),
		trace.WithInstrumentationVersion("v1.44.0"),
		trace.WithSchemaURL("https://opentelemetry.io/schemas/1.24.0"),
	}
	multiCfg := trace.NewTracerConfig(multiOpts...)
	if multiCfg.InstrumentationVersion() != "v1.44.0" {
		fmt.Fprintf(os.Stderr, "expected overwritten version v1.44.0, got %q\n", multiCfg.InstrumentationVersion())
		os.Exit(1)
	}
	if multiCfg.SchemaURL() != "https://opentelemetry.io/schemas/1.24.0" {
		fmt.Fprintf(os.Stderr, "expected overwritten schema URL https://opentelemetry.io/schemas/1.24.0, got %q\n", multiCfg.SchemaURL())
		os.Exit(1)
	}

	fmt.Println("All TracerOption contract assertions passed.")
}